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m. Using the Current Output Functions
The meter provides steady, stepped, and ramped current
output for testing 0-20 mA and 4-20 mA current loops.
Choose source mode, in which the meter supplies the
current, simulate mode, in which the meter regulates
1) Source Mode
Source mode is selected automatically by inserting the
test leads into the
and - jacks
. Use source
mode whenever it is necessary to supply current into a
passive circuit such as a current loop with no loop supply.
Source mode depletes the battery faster than simulate
mode, so use simulate mode whenever possible. The
display looks the same in source and simulate modes.
The way to tell which mode is in use is to see which pair
of output jacks is in use.
2) Simulate Mode
Simulate mode is so named because the meter simulates
a current loop transmitter. Use simulate mode when an
external dc voltage of 15 to 48 V is in series with the
current loop under test.
CAUTION
Set the rotary function switch to one of the mA output
settings BEFORE connecting the test leads to a current
loop. Otherwise, a low impedance from the other rotary
function switch positions could be presented to the loop,
causing up to 35 mA to flow in the loop.
Simulate mode is selected automatically by inserting the test
leads into the
SI and - jacks
. Simulate mode
conserves battery life, so use it instead of source mode
whenever possible. The display looks the same in source
and simulate modes. The way to tell which mode is in use is
to see which pair of output jacks is in use.
l. Two-Hold System
The two-hold system is a data hold feature that will
automatically store a stable reading under the 1 HOLD sub-
display in the lower left hand corner of the LCD. When a
new, stable reading is obtained, the reading under 1 HOLD
will be moved to 2 HOLD and the new reading will be
displayed under 1 HOLD
Depress the
HOLD
button to activate the feature.
Push the button again to de-activate the feature.